Blade-fastening.



R. A, MQKEE- BLADE msmv'mu. APPLIOATIOI I'ILBD FEB. 13 1007.

Patnted Sept. 29, 1908.

3 SHEETS-SHEET 1 INVENTOR 1 v s ATTORNEY.

RI Al W BLADE msmrme. .grnmAnoI'rILnn 53.13, 1907.

" Patented Sept. 29, 1908. a snnrbsmnr 2.

WITNESSES:

M INVENTOR I R. A. MoKEE. BLADE FASTENING. Anudumn IIL'ED ran. 13, 1901.

R Z m 1 E R awm V mm m n M a v P NM ROBERT A McKEE, or MILWAUKEE, Wisconsin; Ass1GNoR-To ALLI-s-cHAL-MERS COMPANY,

OF MILWAUKEE, W ISCQNS IN, A C ORPOBATION OF N'EW'JIQBSEYK BLA E FAs'rENINQf Specification of Letters Patent.

P atented Sept. 29, 1908,.

'To all whom it may concern: r r j Be it known that I,- ROBERT A. MoKEE, a citizen of the United States,residin-g at Milwaukee, in the county of Milwaukee and ofblades .upon such a member in such State of Wisconsin, have invented certain new and useful Improvements in Blade-Fae? tenings, of which t 1 'tion.

e following is a SPGClLfiCfir.

. This invention relates to means for fasten-- ing blades to the spindles of steam turbines, rotary pumps, air compressors, or similar machines designed either for acting upon a fluid, or being actuated by a fluid, the purpose of this invention being to provide a simresents a steam turbine spindle, for exampe,

in elevation, parts being shown in section,

- embodyingthls invention. 2 represents a steam turbine spindle, s1 r in general construction to that shown by F' 1 but illus. trates a modification. Fig. 3 ifiustrates an. elevation of a foundation ring with blades secured thereto. .Fig. v4 illustrates a modification of the structure of thefoundation rings; and Fig. 5' illustrates a perspective of one of the holdin rings. 7.

i I The essential c araeteris'tics of this'inven'-- tion comprise a spindle or similar rotatablemember upon which-fare, mounted founda' tion rings in which blades are assembled, and these foundation rings are 3 then locked by holding rings which prevent displacement or radial re ease of. the blades and foundation rings from the spindle bythe centrifu alv Referring to t force develo ed by the blades during-t e rotation oft jesplindle, f. y

e drawings, the numeral 1 designates the spindle of-a steam turbine which is provide with;'the steps or stages 2, 3 and 4, said spindle being ada ted to-be mounted iii-a stator according to t e ordinary custom, the type of spindle shown being atype belonging to the well known'Parsons type of steam turbine; At thelow' ressure en of each of the stages 2,. Sand t espinfcesses or undercut whereby the foundation rin s and the blades ried thereby, each foundation ring being. in-

Application filed. February 13, 1907. Seria1Nfo. 357,113.

dle is provided with a collar or projection 5,

and 7, respectively, while at-the'high pres- .sure end of each of these stages the spindle is provided with screw threads, as indicated respectively by the numerals 8, 9 and 10 I The numerals 11, 12V and 13, designate rings which are adapted to be slipped over the body of the s indle and rest against the shoulders'7, 6 an 5, respectively. The numeral 14 designates -foundation rings with which blades 15 .are' locked in any suitable manner, a foundation ring and the blades assembled therewith'being-adapted to be seated upon the spindle 1. against'the rings 11, 12 and.13,'respectively, and preferably the rin s 11,12 and 13 areundercut, as designated y the numerals '110', 120 and 130; and the foundation rings next adjacent thereto are provided with projections 16 which are adapted-to engage within the reportions of said rings,

carried thereby are held against outward displacement under the action of centrifugal force. The opposite side of 'a foundation rin is provided with a projecting portion 17, an the holdin ring 18 next adjacent thereto is provided with a,recess 19, within which said. projection 17 is adapted to be received, the op osite side of the holding ring 18 being shape to correspond to the corresponding sideof the rin 11. It will thus be apparent '4 that by assem ling the rings 11, 12 and13,

andthe foundation rings with the blades car' eluded between two holding rings-that the foundation rings and blades carried thereby.

are held within the recessed portions of the "holding, rings, whereby any tendency to move outward under the, action of centrifu gal force is prevented.

The numeral which areformed similar in all respects to the holding rings 18', with theexceptlon that a one of the-faces of each, is preferably plain 100 instead of b undercut or provided with a.

projection, an against these plain facesthejnuts 2-1, 22 and- 23which screwupon'the, screw-threaded portions 10, .9 and 8 of the spindle are adapted to seat, whereby the sev- 105 eral foundation and holding rings. may be pressgd'firmly together against the'e'ollars 5,

6 an p A The construction shown by Fig. 2' of the drawings is 2 0 designates holdinglrings in all essential'partlculars the 11 0 same asthat shown by Fig. 1, the difference being that the holding rings11,'12 and 13 are omitted, the foundation rin s 14. being received directlyagainst the s oulders 50, 60

and 70,'which are undercut to fit the adja cent face of the foundation rings. I

Fig. 4 illustrates a modification of the structure of the foundation ring, the founda- .tion ring-being severed so as to divide it into sections 140,141, 142 and 143, thd shroud 30. being similarly severed so that the foundation rings and blades carried thereby are com osed of a luralitg of segments, the metffod of assem ling t ese segments upon the spindle being in all substantial partlculars the same 3 already described for the' solid foundation rings.

It will be observed that in case the con- .struction illustrated by Fig. 4 is adopted, the

2(. v 4' thrown upon the holdin entire strain due to centrifugalforce will be rings, which isnot the case where the foun a'tion ring is a solid" member.

WhatI claim as 1a The combination with a spindle, of a foundation ring seated thereon, blades locked to said foundation ring to deny relative radial release, by relative axial motion, an annular abutment onthe s indle, and a holding ring seated on the spin e and clamping 881d. foundation against said abutment. '5 a 2. .The combination with aspindle of'a foundation seated thereon, said foundation ring being provided with blades and with projections-ton opposite faces thereof,

holding ring seated on the spin tween said foundation ring tween said foundation ring and one of said adjacent restraining elements.

4; The combination with a spindle, of a row of blades provided with a foundation ring, and two restricting elements com rising cent said foundation ring of the row of blades and a holding ring seated on the spindle adjacent the foundation ring of the row of blades and, by relative axial motion beof the row of blades and one of said ad acent elements, locking the said foundation ring of the row of blades to said abutment to deny radial release of the row of blades fromthe spindle.

' an annulartabutment on said spindle adja- In testimony whereof, I aflix my signature in the presence of two witnesses.

ROBERT A. MoKEE. Witnesses:

H.. 6. CASE,

FRANK E. BENNETT. 

